====== Tree Datatype =======

  * https://towardsdatascience.com/five-advanced-python-features-169c96682350

<code python>
class Tree(dict):
    def __missing__(self, key):
        value = self[key] = type(self)()
        return value
        
tree = Tree()
tree['s1']['s2']['s3'] = '1'
print(tree)
</code>

{{tag>tree python dictionary dict}}